Open Access
ND 2007
Article Number 103
Number of page(s) 4
Section Fission studies
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07735

New experimental and theoretical results for the 235U fission neutron spectrum

N.V. Kornilov1, F.-J. Hambsch1, I. Fabry1, S. Oberstedt1 and S.P. Simakov2

1  EC-JRC-IRMM, 2440 Geel, Belgium
2  Forschungszentrum Karlsruhe, Institute für Reaktorsicherheit, 76344 Eggenstein-Leopoldshafen, Germany

Published online: 21 May 2008

The prompt fission neutron spectrum (PFNS) was measured at 0.5 MeV incident neutron energy. An angular anisotropy in the prompt neutron emission was found. The neutron yield is ~10% higher and the average energy ~80 keV smaller at 90 degree than at 120 degree neutron emission angle. The spectral difference diminishes with increasing prompt neutron energy. The experimental data were successfully described with the semi-empirical "three sources" model.

© CEA 2008